[llvm] [AMDGPU][GlobalISel] Add RegBankLegalize rules for amdgcn_sqrt (PR #194231)

[Matt Arsenault via llvm-commits]

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@@ -70,6 +71,15 @@ define double @v_fneg_fabs_sqrt_f64(double %src)  {
   ret double %sqrt
 }
 
+define double @s_sqrt_f64_gfx12(double inreg %src) {
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arsenm wrote:

Don't need the _gfx12 suffix 

https://github.com/llvm/llvm-project/pull/194231